Department of Physics

Indian Institute Of Technology Madras , Chennai

Magnetic and Spin Hall Magnetoresistance(SMR) studies on oxide heterostructures

Speaker : Suraj T.S.

2017-09-01

Abstract :

Spintronics is an emerging technology, which has been extensively investigated in recent the recent past. Generation, transportation and detection of spin in a controlled manner are very important in spintronic devices. The conversion of charge current to spin current is known as Spin Hall Effect (SHE) and the inverse phenomenon is Inverse SHE (ISHE). The detection of spin is usually realized by the ISHE. The paramagnetic metals such as Pt, W and Ta are widely used for observing ISHE. Recently, Spin Hall Magnetoresistance (SMR) has been studied as an important tool to investigate the conversion of charge to spin and vice-versa. SMR arises due to the simultaneous effect of SHE and ISHE in a bilayer heterostructures consisting of ferromagnetic (or ferrimagnetic) insulator and a normal metal. Whereas, some transition metal oxides also exhibit high electrical conductivity and spin orbit coupling. However, very few results are available till date exploiting the transition metal oxides for the SMR experiments. Superconducting materials possess large spin life time and spin Hall effect studies using superconducting materials are emerging for its applications in superconducting spintronics. I will be presenting the proposed plan of fabricating all oxide hybrid structures for spin transport studies and incorporation of superconducting MgB2 for spin transport studies. In addition, I will also talk about our preliminary results on the bulk MgB2 superconductor.

References

1. Matthias Althammer, Sibylle Meyer, Hiroyasu Nakayama, Stephan Geprägs, Matthias Opel, Rudolf Gross, and Sebastian T. B. Goennenwein “Quantitative study of the spin Hall magnetoresistance in ferromagnetic insulator/normal metal hybrids” Phys. Rev. B 87, 224401 (2013).
2. Matthias Althammer, Joynarayan Mukherjee, Stephan Geprägs, Sebastian T. B. Goennenwein, Matthias Opel1, M. S. Ramachandra Rao, Rudolf Gross “Pure spin current transport in gallium doped zinc oxide” Appl. Phys. Lett. 110, 052403 Feb (2017).
3. Fujiwara, K., Y. Fukuma, J. Matsuno, H. Idzuchi, Y. Niimi, Y. Otani, and H. Takagi, , “5d Iridium oxides for Spin transport” Nat. Com. 4, 2893 (2013).
4. T. S. Suraj, M. Muralidhar , K. Sethupathi , M.S. Ramachandra Rao , Murakami Masato “Enhanced electron-phonon coupling and critical current density in rapid thermally quenched MgB2 bulk samples” AIP Advances 7, 085014 (2017).

Key Speaker Suraj T.S.
Guests None
Place Seminar Room
Start Time 11:00 AM
Finish Time 12:00 PM
External Link None